Piston engine or piston pump



Sept, 19,1933, RSCHMIDT 1,927,617

PISTON ENGINE OR PISTON PUMP Filed Jan. 6, 1951 I" a I v a r (\V I y v.ANvEn/fO/Q 7 ?uooLF Scrlw/zor A-r'r DRIVE f3 Patented Sept. 19, 1933 Iv I I UNITED STATES PATENT. OFFlCE PISTON ENGINE OR PISTON PUMP RudolfSchmidt, Vienna, Austria Application January s, 1931, Serial No.506,926, and in Austria January 15,. 1930 9 Claims. (01. 103-150) I havefiled an application in Austria on Janface and from a radial bendingstress produced uary 15,1930. by deformation and pressure, and furtherby This invention relates to piston engines (piston stretching of thebase of the corrugations and pumps) having a casing, provided with aninlet inclining the latter. From these strains can be 5 valve and anoutlet valve and a piston reciprofound by theory the shape of thecorrugations 6 cating within the said casing. The object of for thesmallest tension and at the greatest bendthe invention is thearrangement of an annular ing of the lamination. Annular laminationselastic diaphragm of undulated sheet metal, constructed in this wayallow comparatively long clamped at its inner circumference to the outerstrokes from A to 1 centimetre even in case'ot wall of the piston and atits outer circumfera. very small width of the annulus (in a prac- 6 enceto the inner wall of the casing. tical construction for instance 40millimetres).

One mode of carrying out the invention is Figs. 4a-4g show various formsof the diaillustrated by way of example on the accomphragm. panyingsheet of drawing in which Figs. 1 and 2 The diaphragm illustrated byFig. 4a is formed.

' 1 are two vertical sectional views, the sections bewith ring shapedcorrugations and with a wavy 7 ing taken at planes which are verticallydisposed line as cross section, with amplitudes, having to each other.Fig. 3 is a detail view and Figs. the maximum M between the innerdiameter d:- 4a to 4g show some constructions of the diaand'the middlediameter dm nearer to the latter phragm. and gradually decreasing tozero towards the The piston 1 reciprocating in. the casing innerdiameter d; and towards the outer diam- 7 2, of the engine forms aworking chamber 3 eter do. of the diaphragm ring. which is provided withan inlet valve 3 and an The diaphragm illustrated by Fig. 4b is formedoutlet valve 3. The piston is packed by a with ring shaped corrugationsand with a wavy diaphragm 4 with respect to the parts 2 and 5 line ascross section, with amplitudes, having the of the casing. A crankmechanism, comprismaximum M between the inner and the middle 3 ing apiston rod 6, a springy connecting rod '7 diameter nearer to the latterand decreasing little provided at its end with the crank-pin hearing ornot towards the outer diameter. 8, serves for driving the reciprocatingpiston 1. .The diagram illustrated by Fig. 4c is formed- 30 The flywheel10 is fixed to the crank-shaft 9 with ring shaped corrugations and witha wavy and carries a rubber-ring 11, which co-operates line as crosssection, with amplitudes, having the 8 as a friction wheel with afriction roller 12, maximum in the middle diameter and gradually mountedon the shaft of a driving motor 13, decreasing to zero towards the innerand tohinged at 14 to the casing, and pressed down wards the outerdiameter of the diaphragm ring.

by its weight or by suitable auxiliary weights G. The diaphragmillustrated by Fig. 4d is formed The common diaphragm pumps are adaptedwith ring shaped corrugations and with'a wavy 9 for very littlepressures having very small'strokes. line as cross section, withamplitudes, having the According to the present invention diaphragmsmaximum in the middle diameter and decreasing are used, which areadapted for great differences little or not towards the outer diameterbut de- 6 of pressures. For this purpose the annular dia-v creasing tozero towards the inner diameter.

phragm 4 is provided with ring shaped corru- A plurality of superposeddiaphragms are em- 9 gations and is of such size that, in view of theployed if it is desired to further reduce the thickdetormation,corresponding to the piston-stroke, ness or the several sheets and .toincrease the the bending stress does not amount to more but stroke. Incase of compression, one diaphragm 46 also not to much less than. thehalt of the stress sheet rests on the other, so that the strain is distowhich the material is subjected. The ,deeper tributed to all diaphragms.Either all diacorrugations are forced from the clamping zones, phragmsare fixed to the casing and piston and where the greatest bendingmoments of presprevented from rubbing on one another by insure anddeformation are present, towards the terposed lubricants, or only thefirst diaphragm 50 middle where no bending moment is present, beis fullyclamped in order to close the working cause the radial stressesadditionally subject to chamber, while the other diaphragmsare gradu- 1bending the base of the corrugations. The ex: ally shortened towards thezone or the greatest act shape of the corrugations results from thebending stress by reducing their outer diameter,

fact that, incase of an even plate, the tension similarly to the severalplates of a plate-spring,

, results at every point from a circumferential 'used for instance as avehicle-spring (Fig. 3).

bendingstressproducedbythecwvature otthe Inordertoattaintherreatestpossiblestroke of the diaphragm at a given thickness of thesheet metal, according to Figs. 4c, 4f and 49 the diaphragm is formedwith ring shaped corrugations a piston reciprocating within the casing,an annular elastic diaphragm clamped in a fluid tight manner at itsinner circumference to the outerwall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations' and with a wavy line as crosssection, with amplitudes, having the maximum between the inner and themiddle diameter nearer to the latter and gradually decreasing to zerotowards the inner and towards the outer diameter of the diaphragm ring.

- 2. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, anannular elastic diaphragm clamped in a fluid tight manner at its' innercircumference to the outer wall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations and with a wavy line as crosssection, with amplitudes having the maximum between the inner and themiddle diameter nearer to the latter and decreasing little or nottowards the outer diameter.

3. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, an annular elastic diaphragm clamped in a fluidtight manner at its innercircumference to the outer wall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations and with a wavy line as crosssection, with amplitudes, having the maximum in the middle, diameter andgradually decreasing to 'zero towards the inner and towards the outerdiameter of the diaphragm ring.

4. In a pump comprising a casing having an inlet valve and an outletvalve and provided with apiston reciprocating within the casing,anannular elastic diaphragm clamped in a fluid tight manner at its innercircumference to the .outer wall of the piston and at its outercircumference to the inner wall of' the casing, said diaphragm beingformed withring shaped corrugations and I "with a wavy line as crosssection with amplitudes, having the maximum in the middle dimeter anddecreasing little or not towards the manner at its inner circumferenceto the outerwall of the piston and at its outer circumference to theinner wall of the casing, the said diaphragm being formed with ringshaped corrugations and with a wavy line as cross section, thecorrugations having a curved or wavy middle line. I

6. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, anannular elastic diaphragm clamped in a fluid tight manner at its innercircumference to the outer wall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations and with a wavy line as crosssection, the corrugations having a curved or wavy middle line and beingarranged symmetrically with respect to this middle. line.

7. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, anannular elastic diaphragm clamped in a fluid tight manner at its innercircumference to the outer wall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations, and with a wavy line as crosssection, and composed o a plurality of superposed plates.

8. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, anannular elastic diaphragm clamped in a fluid tight manner at its innercircumference to the outer wall of the piston and at its outercircumference to the inner wall of the casing, the said diaphragm beingformed with ring shaped corrugations, and

with a wavy line as cross section, and composed of a plurality ofsuperposed .plates, becoming gradually'shorter in the manner of a platespring.

9. In a pump comprising a casing having an inlet valve and an outletvalve and provided with a piston reciprocating within the casing, anannular elastic diaphragm clamped in a fluid tight manner at its innercircumference to the outer sec wall of the piston and at its outercircumference

